A Digital Elevation Model (DEM) is a representation of the topology of the Earth’s surface that can be used to generate orthophotography and contour elevation data, and be used in applications such as drainage modeling, land use studies, viewshed analysis, and other applications where an accurate model of the terrain surface is important.

The grid points in the DEM are sampled to a regular, 5-meter spacing and contain both horizontal coordinates and vertical elevation information for locations on the Earth’s surface. The Level 1 Ortho Only DEM is designed to support the rectification of 1-ft GSD orthophotography. The Level 2 5-ft Contour Capable DEM is designed to support both 1-ft orthophotography and the generation of 5-ft interval contour elevation data. Both products are created through softcopy stereo compilation of ADS40 digital sensor data flown to specifications designed to create 1-ft GSD orthophotography.

Download Product Spec Sheet (pdf)